Valve-gear for steam-engines



No ModeM G. ABRAMS 8v N. NILSON.

VALVE GEAR FOR STEAM ENGINES. A No. 316,433. Patented Apr: 28, 1885.

l m. Q .y E .c I?, A Z j @w/ I Mw e A? l c E FFICFQ GUSTAV ABRAMS ANDNILS NILSON, OF DASEL, MINNESOTA.

VALVE-GEAR FOR STEAM-ENGINES.

SPECIFICATION forming part of Letters Patent No, 316,433, dated April28, 1885.

Application filed February 14, 1855. (No model.)

To all whom it may concern:

Be it known that we, GUsrAv ABRAMs and NILs NILsoN, of Dassel, in thecounty of Meeker and State of Minnesota, have invented certain new anduseful Improvements in Valve- Gear for SteanrEngines, of' which thefollowing is a specification.

Our invention relates to valvegear for steam engines and pumps, and itconsists in a novel construction of the same, as hereinafter fully setforth and claimed.

In the drawings, Figure l representsa portion of a stealn-pump showingour improvements applied thereto. Fig. 2 is a section on the line x ofFig. 1, and Fig. 3 a section on the line y y of Fig. 1.

Aindicatesthe framing of an engine or steampump, as the case may be, atone end of which are the cylinder B and steam-chest C, the formeradapted to receive the piston D and its' piston-rod E, and the latter toreceive the ordinary D-shaped slidevalve F, all of which parts are ofthe usual construction.

The cylinder B is provided with a stuffing box, a, through whichpiston-rod E passes, while the outer end of the latter, in case of apump, as shown in the drawings, passes through 'a similar box, a', intothe pump-cylinder, as shown in Fig. l. The` steam-chest C is providedwith stearninlet l on the rear side, as shown in Fig. l, also withsteam-ports 2 and 3, and outlet 4, as is usual. The cylinder B andsteam-chest C are preferably cast in one piece with the framing A, asshown.

In the framing A, above the piston-rod E, is journaled a rock-shaft, G,provided with tubular head or arm G at right angles to its axis ofoscillation.

To one end of the arm G is keyed or otherwise firmly secured a radialarm, H, while through the tubular head or arm G slides a rod, I, havinga forked lower end adapted to straddle the piston-rod E, as shown inFigs. l and 3, and connected therewith by a pin, b, passing transverselythrough the same.

Upon the side ofthe steam-chest, midway between the ends, is a bracket,J, which may be cast thereon or bolted thereto, as preferred. Thisbracket J is adapted to receive the upper end of an oscillatingsteam-cylinder, K, a set-screw, e, serving to center the cylinder in thebracket J, while the pipe f, extending from the cylinder to thesteam-chest, serves a similar purpose, besides affording a communicationbetween the steam-chest and oscillating cylinder. Pipe f is screwed intothe oscillat ing cylinder K, as shown in Fig. 2, and is smooththroughout the remainder of its length, so as to form a journal for thecylinder to oscillate upon, a suitable packing-gland, g, be ing providedto prevent any-escape of steam.

The lower end of arm H is jointed by a pin, c, to one end of theconnecting rod or pitman L, which has :its other end attached to theouter end of piston d of the cylinder K, as shown in Figs. l and 2.

The lower end of the piston d of cylinder K is provided with a shoe, 7L,which slides upon a rocking lever, M, pivoted midway between its ends toa ledge or projecting rib, A2, cast upon or bolted to the steam-cylinderB, as more clearly shown in Fig. 2. At each end of the rocking lever,but separate there from,` are dogs or latches i t, pivoted to the ledgeor rib A2, or to the side of the cylinder B, in the same vertical planeas the rocking arm M, said dogs or latches being each prcvided with ashoulder, j, and tail lc, as shown in Fig. l.

N indicates a dat spring secured to theledge or rib A2, and having itsends arranged to bear upon the tails lo of the latches t' i', and

thus to throw the latches inward to engage with the ends of the rockinglever Ml when not prevented byV other mechanism. The latches or dogs ii' are provided at their upper ends abovethe shoulders j with set-screwsZ, adapted to be struck by the shoe li, in its travel back and forthupon the rocking lever M. These screws permit adjustment to compensatefor wear ot' the shoe or screws, and to insure the proper tripping ofthe latches.

At one end of the lever M is pivoted or attached a rod, m, which extendsupward, and is attached to a shorter rocking arm, m, rigidly securedupon a shaft or arbor, m2, journaled in the wall of the steam-chest, asshown in Fig. 1, said shaft m2 being connected by an arm, mi, and linkan with the slide-valve F, said arm and link being inclosed within thesteam-chest, while the arms m and m are outside of the same.

ln the drawings, the piston is shown as having reached nearly the limitof its stroke to ICO .the cylinder K now forces derstood that it can.the left, and the completion of its movement will cause the piston-rodE to move the arm H and pitman J, and consequently the oscillatingcylinder K, in the same direction. rIhe oscillation of the cylinder Kwill cause its shoe attached to piston b or its piston-rod, to come intocontact with the screw Z in the upper end of latch or dog i, and throwthe latter backward so that rocking lever M will be free to ride oft'the shoulder k. Steam in the piston b down, and thus rocks lever M uponits pivot and elevates its other end, which engages with the shoulder 7con the latch i. This movement of the lever M, transmitted through rod mand arms m m3 and link m* to the slide-valve F, causes a reversal of theposition Of said valve,

which then admit-s steam through port 2, and

permits the dead steam to exhaust th rough ports 3 and 4. Just beforethe piston D completes its stroke to the right the shoe h, sliding uponthe' rocking lever M, comes into contact with the screw Z in the theoperation before described will be repeated.

There is a constant pressure exerted by the piston d upon rocking leverM, as the oscillatlng cylinder is at all times in communication with thesteam-chest..

While in the drawings theinvention is shown as applied toapumping-engiue, it is to be unbe equally well applied to other styles.

Having thus described our invention, what we claim is-' l. Incombination with a steam-engine and lts slide Or controlling valve, apivoted lever connected with and serving to actuate the valve-latchesfor holding the lever in a xe'd position for a stated period, anoscillating cylluder in communication with the steam-chest -or supply,and connected with the piston-rod 'of the engine,

a and a piston movable within lsaid cylinder, provided with a block tostrike and release the latches alternately, and adapted to rock thelever controlling the valve by reason of the steam-pressure upon it.

. 2. In combination with the slide or revers-` ing valve of an engine,an oscillating cylinder communicating with the chest or supplythe're`of, and a piston movable within the cylinder and adapted to shift orthrow the valve, substantially as explained.

3. In combination with an engine and its slide or controlling valve, anoscillating cylinder communicating withthe Huid-reservoir, and a pistonmovable within said cylinder, connected with the piston-rod, andarranged,sub stantially as described and shown, to actuate the valve, asset forth.

4. In an engine, the-combination, with the slide-valve, of a rockinglever, M, connected with said valve and adapted to impart motionthereto, a latchI at each end of said lever latch or dog i', and

to hold said ends alternately in yan elevated position, an oscillatingcylinder communicating with the steam-supply, and a piston having a shoeadapted to slide upon the rocking lever connected withthe piston-rodandadapted, by reason of its movement therewith, to trip the latches,and by reason of the steampressure upon it to rock or tip the lever andthrow the' valve, all substantially as set forth.

5. In a steam-engine, the combination of a latches at the ends of therocking lever, all

combined and arranged to operate as set forth.

6. In a steam-engine provided with valvecontrolling mechanism,substantially such as described and shown, a pipe, f, communicating withthe stealn-chest and with the oscillating cylinder, and adapted to serveas a pivot for the latter, as set forth.

7. In a steam-engine provided with valvecontrolling mechanism such asshown and described, and with an oscillating steam-cylinder foroperating the same, bracket J, setscrew e, pipef, and packing g.

8. In combination with cylinder B, piston D, and its rod E, steam-chest@slide-valve F,

arranged therein, oscillating cylinder K, piston d within4 saidcylinder, rocking lever M, connected with the slide-valve, aspring-latch at each end of the rocking lever, arm I, connecting thepiston-rod and rocking arm G, and arm H, connected with the piston d andadapted to impart motion thereto and to its cylinder K. l

9. In an engine provided with valve-controlling mechanism such asdescribed and shown, the combination of frame A', rocking arm G,provided with tubular arm G', and arm H, rod I, mounted in said tubulararm G and connected with the piston-rod of the engine, as set forth.

y10. In an engine provided with valve-controlling mechanism such asdescribed and shown, the combination of frame or ledge A, rocking leverM, pivotedl spring-latches at each end ofthe rocking lever provided withset-screws Z, oscillating steam-cylinder K, provided with piston d, andshoe h, adapted to slide freely upon the rocking lever and to rock thesame, as set forth.

Witnesses:

PETER JOHNSON, JOHN J OHNsoN.

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